This paper examines the use of proportional and derivative feedback of the state 6S a means of regularizing and controlling singular systems. Regularizability is defined as the existence of a derivative feedback conrrol Iew such that the closed-loop system is regular. It is shown that the closed-loop system modal frequencies could be assigned arbitrarily if and only if the singular system is strongly controllable.It is further shown that, the eigenvalues of a regularizable system, could be assigned arbitrarily using the controllability property of finite frequency modes.
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